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菌体溶解蛋白LysM作为一个子来阻止MurJ的构造变化
Hidetaka Kohga1, Napathip Lertpreedakorn1, Ryoji Miyazaki1
1Nara Institute of Science and Technology, Ikoma, Nara, Japan.
Science advances
|October 8, 2025
概括
新的研究揭示了菌素蛋白LysM如何向并抑制MurJ,这是一种关键的细菌酶. 这一发现为开发针对耐药细菌的新抗生素提供了一个新的策略.
科学领域:
- 微生物学 微生物学
- 结构生物学 结构生物学
- 药物发现 药物发现 药物发现
背景情况:
- 耐多药细菌对全球健康构成重大威胁,需要新的抗菌策略.
- 糖生物生成途径对于细菌的生存至关重要,而MurJ (脂质II翻转酶) 是大肠杆菌*中的关键膜蛋白.
- 菌体蛋白LysM (SglM) 准MurJ以诱导细胞溶解,但其机制尚不清楚.
研究的目的:
- 阐明菌素蛋白LysM抑制必不可少的细菌酶MurJ的分子机制.
- 确定LysM与MurJ的相互作用的结构基础.
- 为设计针对MurJ的新抗菌剂提供基础.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 来确定MurJ/LysM复合体的结构.
- 用氨酸扫描突变发生和拉下测试来确定关键的功能残留物.
- 进行了分子动力学模拟,以分析MurJ形状的稳定性.
主要成果:
- 冷EM结构显示了MurJ的TM2和TM7之间的LysM,将其锁定在面向外的形状中.
- 通过突变发生和生物化学测试确定了涉及LysM功能的关键残留物.
- 分子动力学模拟证实,LysM稳定了面向外的MurJ状态,阻断了脂质II运输.
结论:
- LysM采用了一种前所未有的机制来抑制MurJ,通过作为一个子来稳定向外的形状.
- 这种结构性洞察力为开发针对MurJ的新型抗菌剂以对抗耐药细菌提供了框架.
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